Preheating device.



G. VAN DAAM.

PREHEATING DEVICE.

APPLICATION LED MAR 27, 1914 1,120,425, Patented Dec. 8, 1914.

M will WITNESSES. INVENTOR m W V 0611M W gyflmklal A TTOR/VEY 40 a planview of said heating element.

enmur VAN DAAM, or BUFFALO',NEW YORK.

PREHEATING DEVICE.

Specification of Letters Patent. l

Application filed March 27, 1914. Serial No. 827,660.

To all whom it may concern:

Be it known that I, GnRRrr VAN DAAM, a citizen of the United States,residing at Buffalo, in the county of Erie, State of New York, haveinvented a new and useful Preheating Device, of which the following is aspecification.

My invention relates to improvements 111 means for delivering pre-heatedair to the combustion chamber of a stove or range or similar device.

The object is to provide an improved device for the constant deliver ofpre-heated air to said combustion cham er irrespective of draftconditions.

The object is also to provide a device which is adapted to withstandintense heat without injury thereto.

The device is adapted for use with the ordinary kitchen range or theFrench range.

Referring to the drawings, which illustrate merely by way of example, asuitable embodiment of my invention-Figure 1 1s a perspective view of aortion of a range, with the top partly bro en away, showing my improveddevice in operative position. Fig. 2 is a perspective view of a portionof the tubing for conducting air to the preheating element. Fig. 3 is aperspective view of the pre-heating element with a ortion of the tubingconnected therewith Fig. 4 is a fragmentary view in elevation of aportion of the tubing showing the connection with the wall of the stoveor range.

Fig. 5 is a side elevation of the heating element on a larger scale.Fig. 6 1s a front elevation of same. Fig. 7 is a vertical section online 7-7 of Fig. 9. Fig. 8 15 a vertical cross-section on line 8-.8 ofFig. Fig. 9 is a horizontal section. Fig. 10 1s Similar numerals referto similar parts throughout the several views.

The pre-heating element 11 is preferably fan-shaped, having a rojectingnozzle 12 provided with an inta e to which is connected the conductingpipe 10. The conducting pipe 10 is connected with the extensions 2 and 8and the elbows 3 and 9. To the lower end of extension 2 is provided theintake nozzle 1, which extends downwardly and is located below the levelof the firebox or combustion chamber.

Fig. i shows a convenient method of extending the section 8 through thewall 6 of the stove, and securing the same in posi- Patented Dec. 8,1914-1 tion by means of the nuts 5 and 7 which is preferably providedwith the notch or recess 17 adapted to receive a strut or other supportfor the top of the stove. This also serves to maintain the position ofthe heating element with respect to the fire-box. The nozzle 12 of theheating element 11 connects with the channel 13, which channel spreadsat its flaring end and delivers to the return channels 14 which in turndeliver to the reversing channels 15. The ends of channels 15 serve asdistributing chambers and deliver through the vents 16 gets of.pre-heated air to the combustion chamber 18. It will thus be seen thatthe air entering through nozzle 12 is delivered almost immediately to anextremely hot portion of the walls forming part of the margin of recess17. This serves somewhat to modify the temperature of this wall. The airthen, returning through channels 14 to channels 15 becomes highly heatedbefore being delivered through the vents 16.

The element 11 is cast in a single structure, by what is known as acored casting, so that there are no separate parts bolted together tobecome distorted or bent out of shape when subjected to intense heat.

The nozzle 1 is placed below the level of the fire-box to prevent anytendency of the flow of air from the element 11 to the nozzle, but onthe contrary, this arrangement serves to secure a constant flow of airfrom the nozzle to and through the heating element 11, whether the draftfrom the firebox to the flue is strong or weak.

It-has been found in previously used air heating and feeding systemsthat where the air intake is placed higher than the fire box orcombustion chamber, that when the draft is insufficient or where thedraft the forming the heating element of an integral cored caststructure this disadvantage is overcome.

. That I claim is 1. LIeans for feeding pre-heated air to a stove orrange comprising an integral hollow heating element consisting of asingle cored casting of fan shaped contour provided with an air intakeat-the middle portion of its arc-shaped margin, and having a marginalrecess in. the straight margin opposite the air intake, said hollow bodyprovided with partitions forming channels as follows, a channelextending directly from the intake nozzle to the wall of the oppositelydisposed recessed margin, two diverging channels extending therefrom andthen doubling back and flanking the first mentioned channel to a pointadjacent the air intake, then diverging indirections corresponding tothe peripheral contour of the body to the walls' flanking the recessedportion, said channels flanking the recessed portion provided with airdischarge vents, and an air conducting pipe connected with said airintake extending horizontally to the outside of the stove and thenextending vertically to a point below the level of the -combustionchamber.

2. Means for feeding pre-heate'd air to a stove or range comprising anintegral holas follows, a channel extending directly 4 from the intake'nozzle to the wall of the oppositely disposed recessed margin, twodiverging channels extending therefrom and then doubling back andflanking the first mentioned channel to a point adjacent the air intake,then diverging in directions corresponding to the peripheral contour ofthe body to the walls flanking the recessed portion, said channelsflanking the recessed por-, tion provided withair discharge vents, anair conducting pipe connected with said air intake extendinghorizontally to the outside of the stove and then extending verticallyto a point below the level of the combustion chamber, and means forsecuring an airtight joint between said: horizontal pipe and the wall ofthe stove throughwhich it pro jects.

GERRIT' VAN DAAM. Witnesses:

MAE HOFMANN, HOWARD S. OKIE.

